Liquid crystal display and driving method thereof

Abstract

A LCD includes at least a first sub-pixel and a second sub-pixel with different area. Each sub-pixel displays luminance according to a positive or a negative data voltage corresponding to a grey value. When the grey values of the first sub-pixel and the second sub-pixel are equal, an average value of the positive and negative data voltages of the first sub-pixel is not equal to an average value of the positive and negative data voltages of the second sub-pixel.

1. A liquid crystal display (LCD), comprising:
 a data driver; 
 a plurality of data lines, electrically coupled to the data driver; 
 a plurality of scan lines; 
 a scan driver, for sequentially enabling the scan lines; and 
 a plurality of display units, each comprising at least:
 a first sub-pixel, controlled by one of the scan lines and used for receiving a first positive data voltage or a first negative data voltage from one of the data lines to generate luminance corresponding to a first grey value or a second grey value; and 
 a second sub-pixel, controlled by one of the scan lines, wherein the first sub-pixel and the second sub-pixel are not the same in area or shape, the second sub-pixel is used for receiving a second positive data voltage or a second negative data voltage from one of the data lines to generate luminance corresponding to a third grey value or a fourth grey value; 
 
 wherein when the first to the fourth grey values are equal, an average value of the first positive data voltage and the first negative data voltage is not equal to an average value of the second positive data voltage and the second negative data voltage. 
 
     
     
       2. The LCD according to  claim 1 , wherein the first sub-pixel further receives a third positive data voltage or a third negative data voltage from one of the data lines to generate luminance corresponding to a fifth grey value or a sixth grey value;
 wherein when the first grey value is equal to the second grey value, the fifth grey value is equal to the sixth grey value and when the first grey value is not equal to the fifth grey value, the average value of the first positive data voltage and the first negative data voltage is not equal to an average voltage of the third positive data voltage and the third negative data voltage. 
 
     
     
       3. A LCD, comprising:
 a data driver; 
 a plurality of data lines, electrically coupled to the data driver; 
 a plurality of scan lines; 
 a scan driver, for sequentially enabling the scan lines; and 
 a plurality of display units, each comprising at least;
 a first sub-pixel, controlled by one of the scan lines and used for receiving a first positive data voltage or a first negative data voltage from one of the data lines to generate luminance corresponding to a first grey value or a second grey value; and 
 a second sub-pixel, controlled by one of the scan lines, wherein the first sub-pixel and the second sub-pixel are not the same in area or shape, the second sub-pixel is used for receiving a second positive data voltage or a second negative data voltage from one of the data lines to generate luminance corresponding to a third grey value or a fourth grey value; 
 
 wherein when the first to the fourth grey values are substantially equal, if the first positive data voltage is equal to the second positive data voltage, the first negative data voltage is not equal to the second negative data voltage. 
 
     
     
       4. The LCD according to  claim 3 , wherein each of the first sub-pixels further receives a third positive data voltage or a third negative data voltage from one of the data lines to generate luminance corresponding to a fifth grey value or a sixth grey value;
 wherein when the third grey value is equal to the fourth grey value, the fifth grey value is equal to the sixth grey value and the third grey value is not equal to the fifth grey value; if the second positive data voltage is equal to the third positive data voltage, the second negative data voltage is not equal to the third negative data voltage. 
 
     
     
       5. A driving method, applied in a LCD having a plurality of display units and data lines, each display unit comprising at least a first sub-pixel and a second sub-pixel, the first sub-pixel and the second sub-pixel being not the same in area, the first sub-pixel used for receiving a first positive data voltage or a first negative data voltage from one of the data lines to generate luminance corresponding to a first grey value or a second grey value; the second sub-pixel used for receiving a second positive data voltage or a second negative data voltage from one of the data lines to generate luminance corresponding to a third grey value or a fourth grey value, the driving method comprising:
 generating the first positive data voltage according to a first feed-through voltage of the first sub-pixel corresponding to the first grey value and inputting the first positive data voltage to the first sub-pixel; 
 generating the first negative data voltage according to a second feed-through voltage of the first sub-pixel corresponding to the second grey value and inputting the first negative data voltage to the first sub-pixel; 
 generating the second positive data voltage according to a third feed-through voltage of the second sub-pixel corresponding to the third grey value and inputting the second positive data voltage to the second sub-pixel; and 
 generating the second negative data voltage according to a fourth feed-through voltage of the second sub-pixel corresponding to the fourth grey value and inputting the second negative data voltage to the second sub-pixel; 
 wherein when the first to the fourth grey values are substantially equal, an average value of the first positive data voltage and the first negative data voltage is not equal to an average value of the second positive data voltage and the second negative data voltage. 
 
     
     
       6. The driving method according to  claim 5 , wherein each of the first sub-pixels further receives a third positive data voltage or a third negative data voltage from one of the data lines to generate luminance corresponding to a fifth grey value or a sixth grey value, and the driving method further comprises:
 setting the third positive data voltage according to a fifth feed-through voltage of the first sub-pixel corresponding to the fifth grey value; 
 setting the third negative data voltage according to a sixth feed-through voltage of the first sub-pixel corresponding to the sixth grey value; 
 wherein when the first grey value is equal to the second grey value, the fifth grey value is equal to the sixth grey value, and when the first grey value is not equal to the fifth grey value, the average value of the first positive data voltage and the first negative data voltage is not equal to an average value of the third positive data voltage and the third negative data voltage. 
 
     
     
       7. The driving method according to  claim 6 , wherein when the third grey value is equal to the fourth grey value, the fifth grey value is equal to the sixth grey value, and when the third grey value is not equal to the fifth grey value, if the second positive data voltage is equal to the third positive data voltage, the second negative data voltage is not equal to the third negative data voltage. 
     
     
       8. The driving method according to  claim 5 , wherein when the first to the fourth grey values are equal, if the first positive data voltage is equal to the second positive data voltage, the first negative data voltage is not equal to the second negative voltage.